Toolbar of RichText editor has different behavior in Chrome and Firefox

Description

Open the link http://dojotoolkit.org/documentation/tutorials/1.9/editor/demo/editor-basic.php in Chrome and Firefox and don't click or input anything in editor area, you will see:
1) In Chrome, only 'Paste' menu is enabled, others are disabled
2) In Firefox, All menus before 'Bold' are disabled, and others are enabled.
But if you click the editor area, they have same menus to be enabled and disabled.
We hope they can behave same in different browser, could you please take a look?